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What does @@variable mean in Ruby?
What are Ruby variables preceded with double at signs ( @@ )? My understanding of a variable preceded with an at sign is that it is an instance variable, like this in PHP:
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How will I know when to create an interface?
I'm at a point in my development learning where I feel like I must learn more about interfaces.
24 Answers
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How ListView's recycling mechanism works
So I have this problem I had before, and naturally I asked for help on here . Luksprog's answer was great because I had no idea about how ListView and GridView optimized itself with recycling Views. So with his advice I was able to change how I added Views to my GridView. Problem is now I have some...
Difference between jQuery parent(), parents() and closest() functions
...sing jQuery for a while. I wanted to use the parent() selector. I also came up with the closest() selector. Could not find any difference between them. Is there any? If yes, what?
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What is a ViewModelLocator and what are its pros/cons compared to DataTemplates?
Can someone give me a quick summary of what a ViewModelLocator is, how it works, and what the pros/cons are for using it compared to DataTemplates?
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How to supply value to an annotation from a Constant java
I am thinking this may not be possible in Java because annotation and its parameters are resolved at compile time. I have an interface as follows,
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Common CSS Media Queries Break Points [duplicate]
I am working on a Responsive Web Site with CSS Media Queries.
13 Answers
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Representing graphs (data structure) in Python
How can one neatly represent a graph in Python ? (Starting from scratch i.e. no libraries!) What data structure (e.g. dicts/tuples/dict(tuples)) will be fast but also memory efficient? One must be able to do various graph operations on it.
As pointed out, the various graph representations...
Colors with unix command “watch”?
Some commands that I use display colors, but when I use them with watch the colors disappears:
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mongodb group values by multiple fields
For example, I have these documents:
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